sort the images according to the level of structure in the proteins shown. sort the items into the appropriate bin.

For this type of question, you’re meant to match each picture of a protein to one of the four levels of protein structure, in order of increasing complexity: primary → secondary → tertiary → quaternary.

Here’s how to sort the images conceptually:

1. Primary structure
   • Looks like: A simple linear chain or “string” of beads (amino acids in a sequence), no obvious 3D folding.
   • Put into the bin labeled “Primary structure.”
2. Secondary structure
   • Looks like: Regular repeating shapes such as:
     • A spiral/coil (α-helix) or
     • A zig‑zag/flat arrow sheet (β‑pleated sheet).
   • Usually just a short segment, not a full globular protein.
   • Put into the bin labeled “Secondary structure.”

3. Tertiary structure
   • Looks like: One single polypeptide chain fully folded into a complex 3D globular shape, often with helices and sheets packed together like a tangled ribbon ball.
   • Only one chain/subunit is present.
   • Put into the bin labeled “Tertiary structure.”

4. Quaternary structure
   • Looks like: Two or more separate folded subunits stuck together, often drawn as several “globules” or “clews” joining into one larger complex.
   • Example description from many homework problems: “Two types of thick coiled threads form four clews, which together form a ball‑shaped structure” → this is quaternary.
   • Put into the bin labeled “Quaternary structure.”

If your question uses four images, the correct logical order from “least structured” to “most structured” is:

• Primary → Secondary → Tertiary → Quaternary.

Since I cannot see your exact figures, match them using these visual cues:

• “Simple chain” → primary
• “Single helix or sheet” → secondary
• “Single folded blob” → tertiary
• “Multiple blobs together” → quaternary